Description:Lindsay Lohan made an appearance on "The Late Show With David Letterman" Tuesday (April 09), where she begrudgingly answered questions about her upcoming rehab and recent legal woes. The actress kept pace, however, poking fun at herself and putting Letterman on the spot for grilling her over her personal life. Lohan was on the show to promote her role in the upcoming film, "Scary Movie 5."(1:27)